hybrid-graphics-linux team mailing list archive

[Matthias Fulz <olz1983@xxxxxxxxxxxxxx>]

Sorry I did reply instead reply to all.......

Here is all new Info I found so far:

On 07/19/2010 10:08 AM, Ruslan N. Marchenko wrote:
> On Mon, 19 Jul 2010, Dave Airlie wrote:
>> Did you try dd'ing it back from userspace? using the ati rom as the
>> image?
>>
>> It might be somehow set to read only at 0xc0000, though I'm not sure
>> how that is achieved,
>>
> Yes, I've tried, no luck %) As if this part of low-mem is RO.
> 

Coutld it be perhaps, that the VGA ROM is directly mapped to the address
by the System Bios?

Perhaps its not even a real RAM Array, instead it's a RAM address which
leads to the VGA ROM?

Any way to read this address under windows?
Perhaps the BIOS is remapping the ATI BIOS to the address under windows,
I would check it, if anyone knows a way to read the addresses under windows.


And here is (I think the problem we have with the RO MEM Array):

http://www.pcguide.com/ref/ram/umaMap-c.html
http://www.pcguide.com/ref/ram/umaShadowing-c.html

So I think we need to find a way to bypass the BIOS Shadowing.
Best would be to do it (if possible) inside the Linux Kernel.

Best Regards

Matthias